Psychology and human factors

Experiments here usually have about 3 factors and 19 runs. Full factorials and fractional factorials are the most common.

Plan one like these

Full factorial
Fractional factorial or screening
Other designs

Show the numbers

The experiments of each kind, with their median size
Kind of design	Experiments	Factors	Runs
Full factorial	4	2.5	13.5
Fractional factorial or screening	2	5.5	14
Other designs	4	1.5	24

Factors and runs are the medians of each kind.

Full factorial

Every combination of the factor levels.

Michael's mistakes on stage: practice hours P, sleep S and dinner D, and a ninth run at the centre of P and SDunn (2015) · 3 factors, 9 runs
Assembly time of hand-inserted components on circuit boards against three fixtures and two layouts, four operators within each layout, two replicates: a nested-factorial designMontgomery (2013) · 3 factors, 48 runs
Rise in heart rate moving the cases of Problem 6.9: bottle type by worker, a 2^2 run four times (Problem 6.10)Montgomery (2013) · 2 factors, 4 runs
Typing speed by key size and keyboard feel, run three times (Problem 5.30)Montgomery (2013) · 2 factors, 18 runs

Fractional factorial or screening

A planned part of the combinations, to find the factors that matter.

Other designs

Optimal, blocked, split-plot and other designs made for the problem.